Representation of Integers HKCE Computer Studies Education Department 2000

Sign-and-magnitude 符號數值表示法 Sign 0 Pos 1 Neg Magnitude

3-bit example

or -0 ?

Two’s Complement 二進制補碼 counter on cassette recorder … Play Reverse

Negative Positive

2’s Complement of 1. Positive Number 2. Binary Format 3. Interchange 0’s and 1’s 4. Add 1 to code

2’s Complement of 1. Positive Number 2. Binary Format 3. Interchange 0’s and 1’s 4. Add 1 to code Ex.

2’s Complement of 1. Positive Number 2. Binary Format 3. Interchange 0’s and 1’s 4. Add 1 to code = +107 Why? Ex.

What is the decimal form of the 2’s complement value, ?

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